Pumping-jack.



ewto z 756-75 3293 PUMPiNG JACK.

APPLICATION FILED JUNE I7. 1915- v Patented Nov. 30, 1915.

POINDEXTER.

WILLIAM S. POINDEXTER, OF BRIDG-EPORT, ILLINOIS.

IPUMPING-J'ACK.

Specification of Letters Patent.

Patented Nov. 3 1), 1915.

Application filed .Tune 17, 1915. Serial No. 34,684.

To all whom it may concern Be it known that 1, WILLIAM S. Poin- DEXTER, a citizen of the United States residing at Bridgeport, in the county of Lawrence and State of Illinois, have invented certain new and useful Improvements in Pumping-Jacks; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to inake and use the same.

My invention relates to improvements in -pumping jacks and more particularly to those primarily designed for 'use in connection with oil well pumps, although the device need not be limited to this one application.

The object of the invention is to improve upon the general construction of devices of the class set forth to such an extent as to provide an extremely simple and .ineXpen' sive jack, yet one which will be efficient and durable and will possess a number of highly advantageous features.

To this end, the inventlon resides in certain novel features of construction and in the unique combinations of parts hereinafter fully described and claimed.

In describing the device, I shall refer to the accompanying drawings wherein like reference characters designate corresponding parts throughout the several views and wherein:

' Figure 1 is a side elevation of a jack constructed in accordance with my invention; Fig. 2 is a rear end View thereof; Fig. 3 is a vertical longitudinal section as seen on the plane indicated by the line' 33 of Fig. 2;

Figs. 4 and 5 are detail vertical transverse sections as seen on the planes indicated by the lines 4 l, 5-5 of Fig, 1; Figs. 6, 7 and i 8 are detail perspective views of portions of the several couplings to. be described; and- Fig. 9 is a similar View of the bearing block.

In these drawings which constitute a part of the application, the numeral 1 indicates asleeper, preferably of cylindrical formation, which is secured against movement by spikes or the like 2, the upper side of the sleeper receiving thereon a pair of arcuate supporting feet 3 carried by the lower ends of a pair of upwardly converging standards 4 whose upper ends are preferably flattened,

' a shaft 5, in the form of a bolt, being passed through said flattened upper ends and through a right angular coupling member 6 cables 8 which lead rearwardly to a horizontally disposed registering grooves 11 which constitute seats for a pair of forwardlyextending horizontal bars 12, said bars being preferably oftubular formation for the sake of lightness. In addition to the grooves 11, the aforesaid abutting faces of the two plates 9 are provided with additional pairs of vertically disposed registering grooves 13 which likewise constitute seats, these seats receiving therein the upper ends of a pair of vertically disposed parallel bars 14: which are likewise preferably in theform of tubes, two of the bolts 10 being passed through the portions of the bars 1% confined in the seats thereof, while the other bolts 10 intercept the seats formed by the grooves 11 and pass throughthe rear ends of the bars 12 therein. By this construction, the bolts in question not. only secure the two sections or plates 9 in contact with each other and in binding frictional contact with the bars 12 andl, but they positively prevent removal of said bars. f The opening 15 in the coupling member 6 through which the shaft 5 passes, may or may not be equipped'with a bushing, but the same is preferable for reasons well known to those skilled in the art to which the invention relates. Since practically all wear is exerted upon substantially the upper side of the opening 1 5, such side is preferably formed by a poly-sided bushing 16 received in a groove which communicates with said opening as clearly shown in Figs. 4 and 7 Disposed at the lower ends of the two upright bars 14: and having seats 13 receiving said ends therein, is a two-part coupling member 6 constructed in practically the same manner as the member Gpreviously described, said member 6 being also pro-- receive therein the lower ends of a pair of upwardly and forwardly inclining tubular bars 17 whose upper ends are secured within downwardly and rearwardly inclined seats 13 formed in a third coupling member 6 which, like the members 6 and 6 is formed in two sections bolted together, and is provided with horizontally disposed seats 11 corresponding to those seen at 11 and 11 and receiving the front ends of the bars 12. It will be noted by reference to the drawings, that bolts 10 not only intercept the seats of the couplings 6, but those with which the coupling members 6 and 6 are provided, whereby the corners .of the entire triangular frame formed by the pipes 12, 14 and 17, are rigidly connected.

Disposed respectively above the coupling member 6 and in rear of the member 6 are the transverse shafts 23 and 18, the latter being connected to the reciprocatory rods 19 which, when actuated, oscillate the triangular frame in such a manner as to cause its upper front corner to move vertically, thereby reciprocating the piston rod 20 of the pump 21 in the necessary manner, connection being established between the rod 20 and the shaft 23 by upright links 22 which depend from said shaft and are pivoted at their lower ends to a cross head or the like 24 carried by said piston rod.

The shafts 18 and 23 are each received by one of a pair of transverse bearing grooves 25 formed in the two identical bearing blocks 26' having on one side undercut tongues 27 which are received in grooves existing between pairs'of parallel undercut ribs 28 which project from and are formed,

integrally with the two sections of the members 6 and 6 removal of the blocks 26 being normally prevented by practically any preferred means such for instance as the set screws 29 threaded through the blocks 26 and into contact with the aforesaid members. By this detail of construction it will be evident that when one 'of the grooves 25 becomes worn, it issimply necessary to remove the shaft therefrom, reverse the bearing block 26 and dispose said shaft in the unworn groove. Furthermore the leverage of the jack and the length of the stroke thereof may be varied by this construction.

From the foregoing description, taken in connection with the accompanying drawings, it will be evident that although comparatively simple and inexpensive construc tion has been provided for the attainment of the desired end, the complete device will be highly efiicient and durable.

- In the drawings, certain specific details of construction have been shown for accomplishing probably the best results, and in the preceding such details have been described, but it will be evident that I need not be limited thereto otherwise than to the extent to which the appended claims restrict me.

I.claim:

1. A pumping jack comprising a pivotally mounted angular frame having at one of its angles a coupling formed -of two parts clamped together, and a bearing having a tongue clamped between the aforesaid parts of the coupling, a reciprocatory member having a pivotal connection with said bearing, and an additional reciprocatory member connected to one of the other angles of the frame,

2. A pumping jack comprising a pivotally mounted angular frame having at one of its angles a coupling formed of two parts clamped together, apair'of parallel undercut ribs carried one by each part of the coupling, a bearing having an angular tongue clamped between said ribs, a reciprocatory member having a pivotal connection with said bearing, and an additional reciprocatory .member pivotally connected to one of the other angles of the frame.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

WILLIAM S. POINDEXTER. Witnesses M. E. WAGNER, IVAN WRIGHT. 

